Carburetor



June 2, 1931. s. L. CARD v 1,807,750

CARBURETO R Filed Dec. 5. 1928 Patented June 2, 1931 SIDNEY L. PICARD, OEDETRQIT, MICHIGAN f CARBURETOR Application led December 5., 19,28. 'Serial No. 323,989.

The present invention pertains to a novel carburetor for internal combustion engines and consists of various improvements in the device shown in my United States Patent No.

= 1,238,812, of September'll, 1917.

The general object of the device, as described in the above mentioned patent, is to provide a variation in the air supply in proportion to the speed of the engine as determined by the suction acting on the fuel noz-V zle. The particular objects of the present invention are to provide better delivery of the air to the tip of the fuel nozzle, better facilities for mixino' at the tip of the nozzle, cushioning means for the movable parts of the air control mechanism, and a device for regulating the smallest opening of the air control mechanism.

The invention is fully disclosed by way of example in the following description and in the accompanying drawing, in which- Figure 1 is a side elevation of the apparatus, showing the novel carburetor construction in vertical section;

Fig. 2 is a plan view of the carburetor partly broken away;

Fig. 3 is a side elevation thereof; and

Fig. 4 is a section on the line 4-4 of Figure 1.

Reference to these views will now be made by use of like characters which are employed to designate corresponding parts throughout.

Figure 1 illustrates the conventional air intake pipe 1 communicating with a superposed mixing chamber or body 2. Adjacent the chamber is a float chamber 3 of usual construction having at its lower end a fuel intake pipe 4 connected to the fuel tank or the vacuum tank. A pipe or conduit 5 extends from the base of the float chamber across the path of the body 2 but does not obstruct the fluid communication between the parts 1 and 2. On the top of the pipe is formed an annular seat 6 on which the lower edge of the y: body 2 is mounted and secured. Into the pipe is threaded a fuel nozzle 7 extending Vupwardly into the body 2, axially thereof, .and ha-ving its Aoutlet 8 yat itsfupper end. Into the free end 9 of the conduit 1 is threaded .a needle valve 1() whichA governs communica, tion between the nozzle 7 4and the bore 1l of the pipe 5.

O11 the upper surface of the pipe isseated a ring A12 having an inner angular Aineanber 13 secured to the inner wall thereof. The; inner member extends upwardly beyond the inner edge of the ring, and the inner wall 14 of the member 18 tapers upwardl7 towards the tip of the nozzle. The upper end Yofthe Vmember r14S-is conical exteriorly as indicated V vby the numeral 15. The parts l2 and 13 are welded together and 4may be consideredin- .tegral, constituting a collar on which alge mounted control devices for the supp-ly ofair as will now be described. The ring .12 is. formed exteriorly ,with a :pair of diametrica'lly opposed ears 16. A pair of sem1-con1cal members 17. are mounted upon the ring 12, fitting over the inner mem` ber.13, and are provided with lugs 18ivhich ,are hinged to the ears 16 by pins 19 as clearly shown in Figures 1, 2 and 3. The ears and lugs are drilled at 20, and into theapertures thus formed are fitted helical springs 21 for a purpose which ,will presently appear.

A part ofthe .inner wall ,of the sections 17 is conical at 22 in order to fit against the conical outer end ofthe member 13. At their upper ends, the members 17 form a Vcylindrical wall 23 surrounding the tip of the nozzle i and extending somewhat beyond the tip.A

A screw 24 is threaded into the body'2 and is formed Vat its outer end with a sere-wdriver -slot 25, while the inner end is conical or pointed as .at 26 and is adapted to enter a semi-conical opening 27formed in the collar 12e-13 beneath the meeting edges of the shutters 17. By means of this device `the Shutters may be caused to assume normally a seine-what open position asgshown in Figure 1, whereby the normal or rest position of the device may be regulated at will.

As in the above mentioned patent, the increased suction in the motor duc to increased speed causes the laps 17 to spread apart, whereby a greater amount of air is drawn into the chamber 2 to compensate for the greater amount of liquid fuel drawn through the nozzle 7 under these conditions. The springs 21 cushion the opening movement of the shutters 17, so that the latter will not lock against the body 2 when the motor quickly accelerates.

The inner conical wall 14 of the member 13 directs the stream of air towards the tip of the nozzle so that the entire volume of air may be brought into close contact with the fuel discharging from the nozzle. Moreover, the cylindrical wall 23 provides a somewhat restricted chamber at the nozzle tip, further insuring;- complete mixing of the air and fuel vapor. As already indicated. the device is readily adjustable by means ot the screw 24 to admit a desired quantity of air into the chamber 2 under ordinary or idlina conditions.

Although a specific embodiment of the invention has been illustrated and described, it will be understood that various alterations in the details of construction may be made without departing from the scope of the invention as indicated by the appended claims.

That I claim is 1. In a carburetor. a mixing body. a collar seated in said body and havinar an inner conical wall. the upper end of said collar being conical exteriorly. and a pair of shutters pivotally connected to said collar and adapted to seat against the conical surfaces of said conical upper end.

2. In a carburetor. a` mixing body. a collar seated in said body and having an inner conical wall. the upper end of said collar bein-:r conical exteriorly. a pair of shutters pivotallv connected t'o said collar and adapted to seat against the conical surfaces of said conical upper end. and spring connections between said collar and shutters to cushion the movement of the latter.

3. In a carburetor, a mixing body., a collar seated in said body. a pair of shutters pivoted to said collar and adapted to engage the upper edge thereof, and a screw threaded in said body and having a tapered end adapted for reception beneath the meeting edges of said shutters whereby to raise or lower the latter.

4C. In a carburetor, a mixing body, a co1- lar mounted in said body, a nozzle mounted in said body cio-axial with said collar, a pair of shutters pivoted to said collar and enclosing said nozzle, said shutters converging towards the upper end of said nozzle to form an inner cylindrical Wall innnediately enclos- 

